EP3739918B1 - Verfahren und vorrichtung zur übertragung von downlink-daten - Google Patents

Verfahren und vorrichtung zur übertragung von downlink-daten Download PDF

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EP3739918B1
EP3739918B1 EP18898293.8A EP18898293A EP3739918B1 EP 3739918 B1 EP3739918 B1 EP 3739918B1 EP 18898293 A EP18898293 A EP 18898293A EP 3739918 B1 EP3739918 B1 EP 3739918B1
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Prior art keywords
network
user plane
pgw
entity
plane connection
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French (fr)
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EP3739918A1 (de
EP3739918A4 (de
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Shanzhi CHEN
Hucheng Wang
Ming Ai
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Datang Mobile Communications Equipment Co Ltd
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Datang Mobile Communications Equipment Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/12—Setup of transport tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H04W76/32—Release of transport tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/06—Registration at serving network Location Register, VLR or user mobility server
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/22—Manipulation of transport tunnels

Definitions

  • the present application relates to the field of wireless communication technologies, and particularly to a method, PGW-C+SMF entity, and computer storage medium, for transmitting downlink data.
  • LTE Long Term Evolution
  • SGW Serving GateWay
  • TAU Tracking Area Update
  • MME Mobile Management Entity
  • EPC Evolved Packet Core
  • 5G uses the tunnel with the Protocol Data Unit (PDU) session granularity, where there is no one-to-one correspondence between the granularities of two kinds of tunnels, so the PGW cannot directly map the tunnel allocated for the EPS bearer to the PDU session after a User Equipment (UE) updates the registration from 4G to 5G.
  • PDU Protocol Data Unit
  • the mobility registration process will be triggered. Since the source-side MME requests the original SGW to only delete the EPS bearer locally, the SGW and the PGW still remain the tunnel allocated for the EPS bearer.
  • the user plane function entity After receiving the downlink data of the UE, the user plane function entity sends the downlink data to the session management function entity; and the session management function entity will still forward the downlink data of the UE to the SGW, thereby causing the error of the downlink data transmission of the UE.
  • the error of the downlink data transmission of the UE may be caused.
  • the document ZTE: "TS 23.502 P-CR to handover from EPS to NGS", 3GPP DRAFT; S2-172154_ TS 23.502 discloses a procedure for handover from 4G to 5G.
  • NGS QoS mappings are allocated such that default EPS bearer map to default Qos flow and dedicated EPS Bearer map to dedicated Qos flow in NGS.
  • the PDU session ID is equal to the default bearer ID of the corresponding PDN connection.
  • the mapped NGS QoS parameters may be provided to PGW -C+SMF by the PCF+PCRF, if PCC is deployed.
  • CHINA MOBILE ET AL "Clarifications for HO procedure from 5GS to EPC with SR UE using N26", EPO Form 1703 01 .91 TRI 3GPP DRAFT; S2-175483 discloses HO procedure from 5GS to EPC with SR UE using N26.
  • This clause specifies PDU Session establishment in the non-roaming and roaming with local breakout cases. The procedure is used to establish a new PDU session as well as to hand over an existing PDU Session between 3GPP access and non-3GPP access.
  • the present application provides a method, PGW-C+SMF entity, and computer storage medium, for transmitting downlink data, so as to solve the problem in the prior art that the error of the downlink data transmission of a UE may be caused in the condition that the UE moves from the EPS network to the 5G network.
  • a network architecture supporting the interoperability of the 5G network and the EPS network of an embodiment of the present application is provided.
  • the N26 interface between the AMF entity in the 5G network and the MME is optionally supported.
  • the network can support the switching between the 5G and EPS networks.
  • the context information (including the mobility context and the context of the session connection) of the UE needs to be transmitted between the MME and AMF entity.
  • the network may configure its registration mode as single registration mode.
  • a system for transmitting downlink data of an embodiment of the present application includes:
  • the session management function entity determines that the UE moves from the first network to the second network after receiving the request message for updating the session management context of the UE, notifies the user plane function entity to delete the user plane connection of the UE in the first network, and notifies the user plane function entity to create the user plane connection of the UE in the second network, so that the session management function entity receives the downlink data of the UE and then transmits the downlink data through the user plane connection in the second network, to avoid from transmitting the downlink data of the UE through the user plane connection in the first network, ensure the accurate transmission of the downlink data of the UE, and further improve the system performance.
  • the session management function entity after determining that the UE switches from the first network to the second network, the session management function entity further needs to determine whether the tunnel types used by the user plane connections in the second network and the first network are same.
  • the session management function entity notifies the user plane function entity to delete the user plane connection of the UE in the first network and create the user plane connection of the UE in the second network.
  • the user plane connection in the first network may be switched into the second network.
  • first network and the second network in the embodiments of the present application are two different networks.
  • the first network is an EPS network and the second network is a 5G network in the embodiments of the present application.
  • the embodiments of the present application provide two ways in which the session management function entity determines that the UE moves from the first network to the second network, which will be illustrated below respectively.
  • the session management function entity determines that the UE moves from the first network to the second network after receiving the request message sent by an AMF entity.
  • the request message is a request message sent by the AMF entity to update the session management context of the UE.
  • the UE After the idle UE determines that it has moved from the EPS network to the 5G network, the UE sends a registration request message to the AMF entity.
  • the UE may determine that it moves from the EPS network to the 5G network in the following ways.
  • the UE determines that it moves from the EPS network to the 5G network according to the received broadcast message of the wireless air interface.
  • the registration request message sent by the UE to the AMF entity carries the old Globally Unique Temporary UE Identity (GUTI); wherein the old GUTI is the 5G GUTI mapped from the 4G GUTI.
  • GUI Globally Unique Temporary UE Identity
  • the AMF entity After receiving the registration request message, the AMF entity determines that the UE moves from the EPS network to the 5G network according to the old GUTI carried in the registration request message; and the AMF entity parses out the MME address from the old GUTI and obtains the context information of the UE from the MME.
  • the AMF entity determines the session management function entity that currently serves the UE according to the context information of the UE, and the AMF entity sends a request message to the session management function entity.
  • the session management function entity can determine that the UE moves from the EPS network to the 5G network after receiving the request message sent by the AMF entity.
  • the AMF entity invokes the update session management context service of the PDU session (Nsmf_PDUSession_UpdateSMContext), sends a request message to the session management function entity to request the session management function entity to update the session management context of the UE.
  • the session management function entity determines that the UE moves from the first network to the second network according to an EPS bearer identifier sent by the AMF entity.
  • the UE After the idle UE determines that it has moved from the EPS network to the 5G network, the UE sends a registration request message to the AMF entity.
  • the UE may determine that it moves from the EPS network to the 5G network in the following ways.
  • the UE determines that it moves from the EPS network to the 5G network according to the received broadcast message of the wireless air interface.
  • the registration request message sent by the UE to the AMF entity carries the old GUTI; wherein the old GUTI is the 5G GUTI mapped from the 4G GUTI.
  • the AMF entity After receiving the registration request message, the AMF entity determines that the UE moves from the EPS network to the 5G network according to the old GUTI carried in the registration request message; and the AMF entity parses out the MME address from the old GUTI and obtains the context information of the UE from the MME.
  • the AMF entity determines the session management function entity that currently serves the UE according to the context information of the UE, and the AMF entity sends a message carrying the EPS bearer identifier to the session management function entity.
  • the session management function entity can determine that the UE moves from the EPS network to the 5G network after receiving the EPS bearer identifier sent by the AMF entity.
  • the two above ways in which the session management function entity determines that the UE moves from the EPS network to the 5G network are only examples for illustrating the embodiments of the present application.
  • the ways, in which the session management function entity determines that the UE moves from the EPS network to the 5G network, to be covered by the embodiments of the present application are not limited to the above examples, and any way in which the session management function entity can determine that the UE moves from the EPS network to the 5G network is applicable to the present application.
  • the session management function entity may be triggered in the following ways to notify the user plane function entity to, delete the user plane connection of the UE in the EPS network and create the user plane connection of the UE in the 5G network. These cases will be illustrated below respectively.
  • the session management function entity determines that the second network does not support the tunnel type used by the user plane connection in the first network.
  • the session management function entity After the session management function entity determines that the tunnel types used by the user plane connections in the EPS network and the 5G network are different, the session management function entity notifies the user plane function entity to delete the user plane connection of the UE in the EPS network and create the user plane connection of the UE in the 5G network if the session management function entity determines that the second network does not support the tunnel type used by the user plane connection in the first network.
  • the AMF entity determines the session management function entity serving the UE according to the context information of the UE.
  • the session management function entity determines that the UE moves from the EPS network to the 5G network.
  • the session management function entity determines that the 5G network does not support the tunnel type used by the user plane connection in the EPS network, so the session management function entity notifies the user plane function entity to, delete the user plane connection of the UE in the EPS network and create the user plane connection of the UE in the 5G network.
  • the user plane function entity after receiving the notification of the session management function entity, deletes the user plane connection of the UE in the EPS network, and creates the user plane connection of the UE in the 5G network.
  • the session management function entity initiates the Sx session termination process and requests the user plane function entity to delete the user plane connection of the UE in the EPS network.
  • the session management function entity sends an N4 session establishment request message or N4 session modification request message to the user plane function entity serving the UE, where the message carries an indication for indicating the user plane function entity to create the user plane connection of the UE in the 5G network.
  • the user plane function entity creates but does not activate a user plane tunnel of the PDU session in the 5G network, so that the user plane function entity can buffer the data packet and trigger the notification of downlink data arrival to the session management function entity in the condition that receiving the downlink data packet of the PDU session.
  • the following takes the first way as an example to illustrate the method for transmitting downlink data of the embodiments of the present application, wherein the session management function entity is represented by the Packet Data Network Gateway Control Plane + Session Management Function (PGW-C+SMF), and the user plane function entity is represented by the Packet Data Network Gateway User Plane + User Plane Function (PGW-U+UPF).
  • PGW-C+SMF Packet Data Network Gateway Control Plane + Session Management Function
  • PGW-U+UPF Packet Data Network Gateway User Plane + User Plane Function
  • a UE in the idle state triggers the mobility registration process after determining that it moves from the EPS network to the 5G network.
  • Step 301 the UE sends a registration request message to the AMF entity.
  • the registration request message carries the old GUTI
  • the old GUTI is the 5G GUTI mapped from the 4G GUTI.
  • Step 302 the AMF entity determines that the UE moves from the EPS network to the 5G network according to the old GUTI and parses out the MME address from the old GUTI.
  • Step 303 the AMF entity obtains the context information of the UE from the MME.
  • Step 304 the AMF entity invokes the Nsmf_PDUSession_UpdateSMContext service and sends a request message to the PGW-C+SMF.
  • the AMF entity determines the PGW-C+SMF serving the UE according to the context information of the UE,and this request message is used to notify the PGW-C+SMF to update the session management context of the UE.
  • Step 305 the PGW-C+SMF determines that the UE moves from the EPS network to the 5G network, and determines that the 5G network does not support the tunnel type used by the user plane connection in the EPS network.
  • Step 306 the PGW-C+SMF notifies the PGW-U+UPF to delete the user plane connection of the UE in the EPS network.
  • the PGW-C+SMF initiates the Sx session termination process, and notifies the PGW-U+UPF to delete the user plane connection of the UE in the EPS network.
  • Step 307 the PGW-C+SMF notifies the PGW-U+UPF to create a user plane connection of the UE in the 5G network.
  • the PGW-C+SMF sends an N4 session establishment request message or N4 session modification request message to the PGW-U+UPF serving the UE to notify the PGW-U+UPF to create the user plane connection of the UE in 5G network.
  • the PGW-U+UPF creates but does not activate a user plane tunnel of the PDU session in the 5G network, so that the PGW-U+UPF can buffer the data packet and trigger the notification of downlink data arrival to the PGW-C+SMF in the condition that receiving the downlink data packet of the PDU session.
  • Step 308 the PGW-C+SMF responds the result of invoking the Nsmf_PDUSession_UpdateSMContext service to the AMF entity.
  • Step 309 and step 310 the AMF entity and the UE complete the NAS signaling interactions and complete the registration process.
  • the session management function entity receives a first indication message for indicating to delete the user plane connection of the UE in the first network sent by the AMF entity.
  • the session management function entity After the session management function entity determines that the tunnel types used by the user plane connections in the EPS network and the 5G network are different, the session management function entity notifies the user plane function entity to delete the user plane connection of the UE in the EPS network and notifies the user plane function entity to create the user plane connection of the UE in the 5G network if the session management function entity receives the first indication message for indicating to delete the user plane connection of the UE in the first network sent by the AMF entity.
  • the AMF entity determines the session management function entity serving the UE according to the context information of the UE.
  • the first indication message for indicating to delete the user plane connection of the UE in the EPS network sent by the AMF entity to the session management function entity may be placed in the request message for updating the session management context of the UE; or the first indication message and the request message are the same message; or the first indication message and the request message are two independent messages.
  • the AMF entity invokes the Nsmf_PDUSession_UpdateSMContext service and sends the request message and/or the first indication message to the session management function entity.
  • the first indication message is used to indicate the session management function entity to notify the user plane function entity to delete the user plane connection of the UE in the EPS network.
  • the session management function entity After receiving the first indication message for indicating to delete the user plane connection of the UE in the EPS network sent by the AMF entity, the session management function entity notifies the user plane function entity to delete the user plane connection of the UE in the EPS network and notifies the user plane function entity to create the user plane connection of the UE in the 5G network.
  • the user plane function entity after receiving the notification of the session management function entity, deletes the user plane connection of the UE in the EPS network, and creates the user plane connection of the UE in the 5G network.
  • the session management function entity initiates the Sx session termination process and requests the user plane function entity to delete the user plane connection of the UE in the EPS network.
  • the session management function entity sends an N4 session establishment request message or N4 session modification request message to the user plane function entity serving the UE, where the message carries an indication for indicating the user plane function entity to create the user plane connection of the UE in the 5G network.
  • the user plane function entity creates but does not activate a user plane tunnel of the PDU session in the 5G network, so that the user plane function entity can buffer the data packet and trigger the notification of downlink data arrival to the session management function entity in the condition that receiving the downlink data packet of the PDU session.
  • the following takes the second way as an example to illustrate the method for transmitting downlink data of the embodiments of the present application, wherein the session management function entity is represented by the PGW-C+SMF, and the user plane function entity is represented by the PGW-U+UPF.
  • a UE in the idle state triggers the mobility registration process after determining that it moves from the EPS network to the 5G network.
  • Step 401 the UE sends a registration request message to the AMF entity.
  • the registration request message carries the old GUTI
  • the old GUTI is the 5G GUTI mapped from the 4G GUTI.
  • Step 402 the AMF entity determines that the UE moves from the EPS network to the 5G network according to the old GUTI and parses out the MME address from the old GUTI.
  • Step 403 the AMF entity obtains the context information of the UE from the MME.
  • Step 404 the AMF entity invokes the Nsmf_PDUSession_UpdateSMContext service and sends a request message to the PGW-C+SMF; and sends a first indication message for indicating to delete the user plane connection of the UE in the first network to the PGW-C+SMF.
  • the first indication message and the request message may be the same message or two independent messages, or the first indication message is placed in the request message.
  • the request message is used to notify the PGW-C+SMF to update the session management context of the UE, and the request message carries the EPS bearer identifier.
  • the AMF entity determines the PGW-C+SMF serving the UE according to the context information of the UE.
  • Step 405 the PGW-C+SMF determines that the UE moves from the EPS network to the 5G network, and the PGW-C+SMF notifies the PGW-U+UPF to delete the user plane connection of the UE in the EPS network.
  • the PGW-C+SMF initiates the Sx session termination process, and notifies the PGW-U+UPF to delete the user plane connection of the UE in the EPS network.
  • Step 406 the PGW-C+SMF notifies the PGW-U+UPF to create a user plane connection of the UE in the 5G network.
  • the PGW-C+SMF sends an N4 session establishment request message or an N4 session modification request message to the PGW-U+UPF serving the UE, where the N4 session establishment request message or the N4 session modification request message carries an indication for indicating the PGW-U+UPF to create the user plane connection of the UE in 5G network.
  • the PGW-U+UPF creates but does not activate a user plane tunnel of the PDU session in the 5G network, so that the PGW-U+UPF can buffer the data packet and trigger the notification of downlink data arrival to the PGW-C+SMF in the condition that receiving the downlink data packet of the PDU session.
  • Step 407 the PGW-C+SMF responds the result of invoking the Nsmf_PDUSession_UpdateSMContext service to the AMF entity.
  • Step 408 and step 409 the AMF entity and the UE complete the NAS signaling interactions and complete the registration process.
  • the session management function entity receives a second indication message for indicating to delete the user plane connection of the UE in the first network sent by an SGW; wherein the second indication message is sent by the SGW according to the indication from an MME.
  • the session management function entity After the session management function entity determines that the tunnel types used by the user plane connections in the EPS network and the 5G network are different, the session management function entity notifies the user plane function entity to delete the user plane connection of the UE in the EPS network and notifies the user plane function entity to create the user plane connection of the UE in the 5G network if the session management function entity receives the second indication message for indicating to delete the user plane connection of the UE in the first network sent by the SGW.
  • the AMF entity determines that the UE moves from the EPS network to the 5G network according to the old GUTI carried in the registration request message.
  • the AMF entity parses out the MME address from the old GUTI carried in the registration request message and obtains the context information of the UE from the MME.
  • the AMF entity determines the session management function entity serving the UE according to the context information of the UE.
  • the AMF entity sends a confirmation message to the MME after obtaining the context information of the UE from the MME.
  • the MME indicates the SGW to send the second indication message for indicating to delete the user plane connection of the UE in the EPS network to the session management function entity.
  • the confirmation message sent by the AMF entity to the MME carries the indication information, which is used for indicating the MME to set a delete session request message sent to the SGW so that the SGW sends the second indication messagefor indicating to delete the user plane connection of the UE in the EPS network to the session management function entity; or after receiving the confirmation message, the MME autonomously determines that there is a need to indicate the SGW to send the second indication message for indicating to delete the user plane connection of the UE in the EPS network to the session management function entity.
  • the MME sets the operation indication as 1 in the delete session request message sent to the SGW; and after receiving the delete session request message, the SGW sends the second indication message for indicating to delete the user plane connection of the UE in the EPS network to the session management function entity according to the operation indication value.
  • the second indication message sent by the SGW to the session management function entity may also be the delete session request message in the embodiments of the present application.
  • the process in which the session management function entity notifies the user plane entity to delete the user plane connection of the UE in the EPS network and the process in which the session management function entity notifies the user plane entity to create the user plane connection of the UE in the 5G network may be triggered simultaneously or separately.
  • the session management function entity after the session management function entity receives the second indication message for indicating to delete the user plane connection of the UE in the EPS network sent by the SGW, the session management function entity notifies the user plane entity to delete the user plane connection of the UE in the EPS network.
  • the session management function entity determines that the UE moves from the EPS network to the 5G network, the session management function entity notifies the user plane entity to create the user plane connection of the UE in the 5G network in the condition that the tunnel types of the user plane connections of the UE in the EPS network and the 5G network are different.
  • the session management function entity after the session management function entity receives the second indication message for indicating to delete the user plane connection of the UE in the EPS network sent by the SGW, the session management function entity notifies the user plane function entity to delete the user plane connection of the UE in the EPS network and create the user plane connection of the UE in the 5G network.
  • the user plane function entity after receiving the notification of the session management function entity, deletes the user plane connection of the UE in the EPS network, and creates the user plane connection of the UE in the 5G network.
  • the session management function entity initiates the Sx session termination process and requests the user plane function entity to delete the user plane connection of the UE in the EPS network.
  • the session management function entity sends an N4 session establishment request message or N4 session modification request message to the user plane function entity serving the UE, where the message carries an indication for indicating the user plane function entity to create the user plane connection of the UE in the 5G network.
  • the user plane function entity creates but does not activate a user plane tunnel of the PDU session in the 5G network, so that the user plane function entity can buffer the data packet and trigger the notification of downlink data arrival to the session management function entity in the condition that receiving the downlink data packet of the PDU session.
  • the following takes the third way as an example to illustrate the method for transmitting downlink data of the embodiments of the present application, wherein the session management function entity is represented by the PGW-C+SMF, and the user plane function entity is represented by the PGW-U+UPF.
  • a UE in the idle state triggers the mobility registration process after determining that it moves from the EPS network to the 5G network.
  • Step 501 the UE sends a registration request message to the AMF entity.
  • the registration request message carries the old GUTI
  • the old GUTI is the 5G GUTI mapped from the 4G GUTI.
  • Step 502 the AMF entity determines that the UE moves from the EPS network to the 5G network according to the old GUTI and parses out the MME address from the old GUTI.
  • Step 503 the AMF entity obtains the context information of the UE from the MME.
  • Step 504 the AMF entity invokes the Nsmf_PDUSession_UpdateSMContext service and sends a request message to the PGW-C+SMF.
  • the request message is used to notify the PGW-C+SMF to update the session management context of the UE, and the request message carries the EPS bearer identifier.
  • the AMF entity determines the PGW-C+SMF serving the UE according to the context information of the UE.
  • Step 505 the PGW-C+SMF determines that the UE moves from the EPS network to the 5G network, and the PGW-C+SMF notifies the PGW-U+UPF to create the user plane connection of the UE in the 5G network.
  • the PGW-C+SMF sends an N4 session establishment request message or an N4 session modification request message to the PGW-U+UPF serving the UE, where the N4 session establishment request message or the N4 session modification request message carries an indication for indicating the PGW-U+UPF to create the user plane connection of the UE in 5G network.
  • the PGW-U+UPF creates but does not activate a user plane tunnel of the PDU session in the 5G network, so that the PGW-U+UPF can buffer the data packet and trigger the notification of downlink data arrival to the PGW-C+SMF in the condition that receiving the downlink data packet of the PDU session.
  • Step 506 the PGW-C+SMF responds the result of invoking the Nsmf_PDUSession_UpdateSMContext service to the AMF entity.
  • Step 507 the AMF entity sends a confirmation message to the MME.
  • this confirmation message carries the indication information, which is used for indicating the MME to set a delete session request message sent to the SGW so that the SGW sends the second indication message for indicating to delete the user plane connection of the UE in the EPS network to the PGW-C+SMF.
  • this confirmation message contains no indication information.
  • the MME determines that the UE moves from the EPS network to the 5G network after receiving the confirmation message.
  • the MME autonomously sets the delete session request message sent to the SGW so that the SGW sends the second indication message for indicating to delete the user plane connection of the UE in the EPS network to the PGW-C+SMF.
  • Step 508 the MME sends a delete session request message to the SGW.
  • the MME sets the operation indication as 1 in the delete session request message sent to the SGW; and after receiving the delete session request message, the SGW sends the second indication message for indicating to delete the user plane connection of the UE in the EPS network to the PGW-C+SMF according to the operation indication value.
  • Step 509 the SGW sends the second indication message for indicating to delete the user plane connection of the UE in the EPS network to the PGW-C+SMF.
  • the indication request message may be the delete session request message.
  • Step 510 the PGW-C+SMF notifies the PGW-U+UPF to delete the user plane connection of the UE in the EPS network.
  • the PGW-C+SMF initiates the Sx session termination process, and notifies the PGW-U+UPF to delete the user plane connection of the UE in the EPS network.
  • Step 511 the PGW-C+SMF returns a delete session response to the SGW.
  • Step 512 the SGW returns the delete session response to the MME.
  • Step 513 and step 514 the AMF entity and the UE complete the NAS signaling interactions and complete the registration process.
  • a first session management function entity of an embodiment of the present application includes a processor 600 and a memory 601; wherein the processor 600 is configured to read a program in the memory to:
  • the processor 600 is further configured to: determine that a tunnel type used by the user plane connection in the second network is different from a tunnel type used by the user plane connection in the first network after determining that the UE moves from the first network to the second network and before notifying the user plane function entity to delete the user plane connection of the UE in the first network and notifying the user plane function entity to create the user plane connection of the UE in the second network.
  • the first network is an EPS network and the second network is a 5G network.
  • processor 600 is further configured to:
  • processor 600 is further configured to:
  • the bus architecture may include any numbers of interconnected buses and bridges. Specifically various circuits of one or more processors represented by the processor 600 and of the memory represented by the memory 601 are linked together. The bus architecture may further link various other circuits such as peripheral device, voltage regulator and power management circuit, which are all well known in the art and thus will not be further described again herein.
  • the bus interface provides an interface.
  • the processor 600 is responsible for managing the bus architecture and general processing, and the memory 601 may store the data used by the processor 600 in the condition that performing the operations.
  • the procedure disclosed by the embodiment of the present application may be applied in the processor 600 or implemented by the processor 600.
  • each step of the signal processing flow may be completed by the integrated logic circuit of hardware in the processor 600 or the indication in the form of software.
  • the processor 600 may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may implement or perform each method, step and logical block diagram disclosed in the embodiments of the present application.
  • the general-purpose processor may be a microprocessor or any conventional processor or the like.
  • the steps of the method disclosed in combination with the embodiments of the present application may be directly completed by a hardware processor, or completed by a combination of hardware and software modules in the processor.
  • the software modules may be located in the random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable read only memory, register and other mature storage medium in the art.
  • the storage medium is located in the memory 601, and the processor 600 reads the information in the memory 601 and completes the steps of the signal processing flow in combination with its hardware.
  • a second session management function entity of an embodiment of the present application includes:
  • the determining module 700 is further configured to: determine that a tunnel type used by the user plane connection in the second network is different from a tunnel type used by the user plane connection in the first network after determining that the UE moves from the first network to the second network and before notifying the user plane function entity to delete the user plane connection of the UE in the first network and notifying the user plane function entity to create the user plane connection of the UE in the second network.
  • the first network is an EPS network and the second network is a 5G network.
  • the determining module 700 is further configured to:
  • the notification module 701 is further configured to:
  • An embodiment of the present application provides a readable storage medium, which is a non-volatile readable storage medium and includes the program codes which are configured, in the condition that running on a computer, to cause the computer to perform the above-mentioned actions of the session management function entity transmitting the downlink data.
  • an embodiment of the present application further provides a method for transmitting downlink data. Since the device corresponding to this method is the session management function entity in the system for transmitting downlink data of the embodiments of the present application and the principle solving the problem of this method is similar to that of the device, the implementations of this method may refer to the implementations of the device, and the repeated description thereof will be omitted here.
  • a method for transmitting downlink data of an embodiment of the present application includes the following steps.
  • Step 800 a session management function entity determines that a UE moves from a first network to a second network after receiving a request message for updating the session management context of the UE.
  • Step 801 the session management function entity notifies a user plane function entity to delete a user plane connection of the UE in the first network and notifies the user plane function entity to create a user plane connection of the UE in the second network, so that the user plane function entity transmits the downlink data of the UE through the user plane connection created in the second network.
  • the method further includes: the session management function entity determines that a tunnel type used by the user plane connection in the second network is different from a tunnel type used by the user plane connection in the first network after the session management function entity determines that a UE moves from a first network to a second network and before the session management function entity notifies a user plane function entity to delete a user plane connection of the UE in the first network and notifies the user plane function entity to create a user plane connection of the UE in the second network.
  • the first network is an EPS network and the second network is a 5G network.
  • the session management function entity determines that a UE moves from a first network to a second network, which includes:
  • the method further includes:
  • the present application can also be implemented by the hardware and/or software (including the firmware, resident software, microcode and the like). Further, the present application can adopt the form of computer program products on the computer usable or computer readable storage medium, which has the computer usable or computer readable program codes implemented in the medium, to be used by the indication execution system or used in combination with the indication execution system.
  • the computer usable or computer readable storage medium can be any medium, which can contain, store, communicate with, transmit or transfer the programs, to be used by the indication execution system, apparatus or device, or used in combination with the indication execution system, apparatus or device.

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Claims (10)

  1. Verfahren zum Senden von Abwärtsstreckendaten, das Folgendes umfasst:
    Bestimmen (800) durch eine Paketdatennetz-Gateway-Steuerungsebenen+Sitzungsmanagementfunktions-Einheit, PGW-C+SMF-Einheit, dass ein Anwendergerät, UE, sich von einem ersten Netz zu einem zweiten Netz bewegt, nachdem eine Anforderungsnachricht zum Aktualisieren eines Sitzungsmanagementkontexts des UE empfangen worden ist;
    Benachrichtigen (801) durch die PGW-C+SMF-Einheit einer Paketdatennetz-Gateway-Anwenderebenen+Anwenderebenenfunktions-Einheit, PGW-U+UPF-Einheit, eine Anwenderebenenverbindung des UE im ersten Netz zu löschen und eine Anwenderebenenverbindung des UE im zweiten Netz zu erstellen, derart, dass die PGW-U+UPF-Einheit Abwärtsstreckendaten des UE über die Anwenderebenenverbindung, die im zweiten Netz erstellt wurde, sendet; wobei
    das erste Netz ein entwickeltes Paketsystemnetz, EPS-Netz, ist und das zweite Netz ein 5G-Netz ist.
  2. Verfahren nach Anspruch 1, wobei das Verfahren ferner Folgendes umfasst:
    Bestimmen durch die PGW-C+SMF-Einheit, dass ein Tunneltyp, der durch die Anwenderebenenverbindung im zweiten Netz verwendet wird, von einem Tunneltyp, der durch die Anwenderebenenverbindung im ersten Netz verwendet wird, verschieden ist, nachdem die PGW-C+SMF-Einheit bestimmt hat, dass sich das UE vom ersten Netz zum zweiten Netz bewegt, und bevor die PGW-C+SMF-Einheit der PGW-U+UPF-Einheit mitteilt, die Anwenderebenenverbindung des UE im ersten Netz zu löschen und die Anwenderebenenverbindung des UE im zweiten Netz zu erstellen.
  3. Verfahren nach Anspruch 1, wobei das Bestimmen (800) durch die PGW-C+SMF-Einheit, dass das UE sich vom ersten Netz zum zweiten Netz bewegt, Folgendes umfasst:
    Bestimmen durch die PGW-C+SMF-Einheit, dass das UE sich vom ersten Netz zum zweiten Netz bewegt, nachdem die Anforderungsnachricht, die durch eine Zugangs- und Mobilitätsmanagementfunktions-Einheit, AMF-Einheit, gesendet wurde, empfangen worden ist; oder
    Bestimmen durch die PGW-C+SMF-Einheit, dass das UE sich vom ersten Netz zum zweiten Netz bewegt, gemäß einer EPS-Trägerkennung, die durch die AMF-Einheit gesendet wurde.
  4. Verfahren nach Anspruch 1, wobei das Verfahren ferner Folgendes umfasst:
    Bestimmen durch die PGW-C+SMF-Einheit, dass das zweite Netz einen Tunneltyp, der durch die Anwenderebenenverbindung im ersten Netz verwendet wird, nicht unterstützt, bevor die PGW-C+SMF-Einheit der PGW-U+UPF-Einheit mitteilt, die Anwenderebenenverbindung des UE im ersten Netz zu löschen; oder
    Empfangen durch die PGW-C+SMF-Einheit einer ersten Anzeigenachricht zum Angeben, die Anwenderebenenverbindung des UE im ersten Netz zu löschen, die durch eine AMF-Einheit gesendet wurde, bevor die PGW-C+SMF-Einheit der PGW-U+UPF-Einheit mitteilt, die Anwenderebenenverbindung des UE im ersten Netz zu löschen; oder
    Empfangen durch die PGW-C+SMF-Einheit einer zweiten Anzeigenachricht zum Angeben, die Anwenderebenenverbindung des UE im ersten Netz zu löschen, die durch ein "Serving GateWay", SGW, gesendet wurde, bevor die PGW-C+SMF-Einheit der PGW-U+UPF-Einheit mitteilt, die Anwenderebenenverbindung des UE im ersten Netz zu löschen; wobei die zweite Anzeigenachricht durch die SGW gemäß einer Angabe einer Mobilitätsmanagementeinheit, MME, gesendet wurde.
  5. Paketdatennetz-Gateway-Steuerungsebenen+Sitzungsmanagementfunktions-Einheit, PGW-C+SMF-Einheit, die Folgendes umfasst:
    ein Bestimmungsmodul (700), das konfiguriert ist, zu bestimmen, dass ein Anwendergerät, UE, sich von einem ersten Netz zu einem zweiten Netz bewegt, nachdem eine Anforderungsnachricht zum Aktualisieren eines Sitzungsmanagementkontexts des UE empfangen worden ist;
    ein Mitteilungsmodul (701), das konfiguriert ist, einer Paketdatennetz-Gateway-Anwenderebenen+Anwenderebenenfunktions-Einheit, PGW-U+UPF-Einheit, mitzuteilen, eine Anwenderebenenverbindung des UE im ersten Netz zu löschen und der PGW-U+UPF-Einheit mitzuteilen, eine Anwenderebenenverbindung des UE im zweiten Netz zu erstellen, derart, dass die PGW-U+UPF-Einheit Abwärtsstreckendaten des UE über die Anwenderebenenverbindung, die im zweiten Netz erstellt wurde, sendet; wobei
    das erste Netz ein entwickeltes Paketsystemnetz, EPS-Netz, ist und das zweite Netz ein 5G-Netz ist.
  6. PGW-C+SMF-Einheit nach Anspruch 5, wobei das Bestimmungsmodul (700) ferner konfiguriert ist zum
    Bestimmen, dass ein Tunneltyp, der durch die Anwenderebenenverbindung im zweiten Netz verwendet wird, von einem Tunneltyp, der durch die Anwenderebenenverbindung im ersten Netz verwendet wird, verschieden ist, nachdem die PGW-C+SMF-Einheit bestimmt hat, dass sich das UE vom ersten Netz zum zweiten Netz bewegt, und bevor die PGW-C+SMF-Einheit der PGW-U+UPF-Einheit mitteilt, die Anwenderebenenverbindung des UE im ersten Netz zu löschen und die Anwenderebenenverbindung des UE im zweiten Netz zu erstellen.
  7. PGW-C+SMF-Einheit nach Anspruch 5, wobei das Bestimmungsmodul (700) ferner konfiguriert ist zum
    Bestimmen, dass das UE sich vom ersten Netz zum zweiten Netz bewegt, nachdem die Anforderungsnachricht, die durch eine Zugangs- und Mobilitätsmanagementfunktions-Einheit, AMF-Einheit, gesendet wurde, empfangen worden ist; oder
    Bestimmen, dass das UE sich vom ersten Netz zum zweiten Netz bewegt, gemäß einer EPS-Trägerkennung, die durch die AMF-Einheit gesendet wurde.
  8. PGW-C+SMF-Einheit nach Anspruch 5, wobei das Mitteilungsmodul 701 ferner konfiguriert ist zum
    Bestimmen, dass das zweite Netz einen Tunneltyp, der durch die Anwenderebenenverbindung im ersten Netz verwendet wird, nicht unterstützt, bevor die PGW-C+SMF-Einheit der PGW-U+UPF-Einheit mitteilt, die Anwenderebenenverbindung des UE im ersten Netz zu löschen; oder
    Empfangen einer ersten Anzeigenachricht zum Angeben, die Anwenderebenenverbindung des UE im ersten Netz zu löschen, die durch eine AMF-Einheit gesendet wurde, bevor die PGW-C+SMF-Einheit der PGW-U+UPF-Einheit mitteilt, die Anwenderebenenverbindung des UE im ersten Netz zu löschen; oder
    Empfangen einer zweiten Anzeigenachricht zum Angeben, die Anwenderebenenverbindung des UE im ersten Netz zu löschen, die durch ein "Serving GateWay", SGW, gesendet wurde, bevor die PGW-C+SMF-Einheit der PGW-U+UPF-Einheit mitteilt, die Anwenderebenenverbindung des UE im ersten Netz zu löschen; wobei die zweite Anzeigenachricht durch die SGW gemäß einer Angabe einer Mobilitätsmanagementeinheit, MME, gesendet wurde.
  9. PGW-C+SMF-Einheit nach einem der Ansprüche 5 bis 8, wobei ein Prozessor (600) konfiguriert ist, ein Programm in den Arbeitsspeicher (601) zu lesen, um einen Prozessor zu veranlassen, die Schritte des Bestimmungsmoduls (700) und des Mitteilungsmoduls (701) durchzuführen.
  10. Computerspeichermedium, in dem ein Computerprogramm gespeichert ist, wobei das Computerprogramm durch einen Prozessor (600) ausgeführt wird, der in der Paketdatennetz-Gateway-Steuerungsebene+Sitzungsmanagementfunktion, PGW-C+SMF, enthalten ist, um die PGW-C+SMF-Einheit zu veranlassen zum
    Bestimmen, dass ein Anwendergerät, UE, sich von einem ersten Netz zu einem zweiten Netz bewegt, nachdem eine Anforderungsnachricht zum Aktualisieren eines Sitzungsmanagementkontexts des UE empfangen worden ist; und
    Mitteilen einer Paketdatennetz-Gateway-Anwenderebenen+Anwenderebenenfunktions-Einheit, PGW-U+UPEF-Einheit, eine Anwenderebenenverbindung des UE im ersten Netz zu löschen und eine Anwenderebenenverbindung des UE im zweiten Netz zu erstellen, derart, dass die PGW-U+UPF-Einheit Abwärtsstreckendaten des UE über die Anwenderebenenverbindung, die im zweiten Netz erstellt wurde, sendet; wobei
    das erste Netz ein entwickeltes Paketsystemnetz, EPS-Netz, ist und das zweite Netz ein 5G-Netz ist.
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